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Hi Jose, Would that work with tens of millions of points in a bottom layer and with boxes and lines in a top layer, with the boxes and lines changing without having to redraw the stuff on the bottom layer? If so, what would the performance be like? Would it involve rasterisation being done twice? I also worry that such a large texture might take up a lot of additional memory. Regards, Haraldur On 10/02/10 14:15, Jose Commins wrote: > > You can try using 3D textures for volumetric rendering, it lends > itself to layer-slicing quite well. > > Regards, > Jose. >> Message: 1 >> Date: Tue, 09 Feb 2010 17:15:24 +0000 >> From: "Haraldur Tristan Gunnarson" <harg pml ac uk> >> To: <gtkglext-list gnome org> >> Subject: [GtkGLExt] Is it possible to use overlays with gtkglextmm? >> Message-ID: <4B71982C 6040506 pml ac uk> >> Content-Type: text/plain; charset="ISO-8859-1" >> >> Greetings, >> >> I have been writing, as my first significant project using OpenGL, a GUI >> using gtkglextmm for viewing large datasets as a cloud of points. I have >> some measuring tools that are currently rendered by drawing some of the >> points and then the line or box of the tool while the user is dragging >> the cursor. This works well with small datasets but gets sluggish with >> the larger ones, particularly the ones that require caching. I would >> like to use overlays as a conceptually and practically simple (I hope) >> way of drawing the rulers (and so on) without having to redraw the >> points each time. >> >> How do I do this while using gtkglextmm? I found the method >> Gdk::GL::Config::get_layer_plane() but no other obvious things in the >> documentation. Looking at an example using WGL, it appears I need to >> create an "layer context" for the overlay, but I do not see how to do >> that in gtkglextmm. Does it work in a similar way and, if so, how? >> >> Thanks in advance, >> >> Haraldur
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